Russia visit from 9-20 July (St. Petersburg)

I am expat Engineer currently working in Doha and planning to travel solo; flying into Moscow from Protected contentProtected content catch the fast train to St Petersburg for 6 nights ( Protected content ).This is my first visit to Russia and I am very existed and looking for the trip to explore all the highlights and sightseeing and experience a true Russian culture/heritage/food/drinks/nature, etc.

I apreciate any tips or advice, or tell me of any happenings during my stay. Otherwise it would be great if anyone wants to join me or meet up over drinks, lunch, dinner, sightseeing or a day tour to outside of town, etc..